Question

qual o valor de X²+2X+15=0​

Answer 1

Resposta:

X²+2X - 15 = 0

a = 1 b = 2 c = -  15

Δ = b² - 4.a.c

Δ = b2 - 4.a.c

Δ = 22 - 4 . 1 . -15

Δ = 4 - 4. 1 . -15

Δ = 64

Há 2 raízes reais.

2) Aplicando Bhaskara:

x = (-b +- √Δ)/2a

x' = (-2 + √64)/2.1     x'' = (-2 - √64)/2.1

x' = 6 / 2     x'' = -10 / 2

x' = 3 x'' = -5